The large-scale battle won by Polish-Austrian-German forces lead by King of Poland Jan III Sobieski against the Ottoman Empire army commanded by Grand Vizier Merzifonlu Kara Mustafa Pasha, which took place on September 12, 1683 after Vienna had been besieged by Turks for two months. The battle broke the power of Ottoman Empire and had the most far-reaching consequences in the Great Turkish War.